Decide if you want Aluminum or Copper. Aluminum can perform as well and is lighter, but cannot be as easily repaired as a copper rad.
If you go aluminum, Griffin is the way to go. I'm running a 26" Exact Fit aluminum rad and zero complaints. Check out their Exact Fit line with the top and bottom stamped to look stock. I painted mine black. I've talked to several others who started with a BeCool aluminum and had issues, switched to Griffin and problems solved.
If you decide on a copper core rad, I've researched this a ton and I give the thumbs up for US Radiators (they also offer aluminum rads). I've never used one of their products, but have read a ton of positive reviews.
Either way you go, remember it's not the # of rows, but rather the tube size. My Griffin has 2 rows, but the tube diameter is so big, the total exposed surface area is greater than a basic 3 or 4 row of other brands (depending on given tube diameter). US radiator follows the same approach as Griffin in larger tube size when possible, although sometimes will use 3 rows which is more common for copper core rads.
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